Wrangel Palace is a townhouse mansion on Riddarholmen islet in the old town of Stockholm. The southern tower used to be part of Gustav Vasa's defence fortifications from the 1530s. Around 1630, the mansion was turned into a palace for Lars Sparre. From 1652 to 1670, the palace was rebuilt and expanded by architect Nicodemus Tessin the Elder for Count Carl Gustaf Wrangel. After a fire in 1693, the palace was rebuilt and expanded once again, this time to become a royal residence after the devastating fire that left the Tre Kronor Castle in ruins (1697). In 1802, the palace had to be rebuilt once again after a fire. This time the architect was C.G. Gjörwell.
Wrangel Palace was the official Stockholm residence of the royal family and court from 1697 until 1754, when the Royal Palace of Stockholm was completed. During this time, the Palace was called Kungshuset (The Kings House). From 1756 to 1928, it housed the Statskontoret (Office of state). Since 1756 the palace has housed Svea Court of Appeal (Svea Hovrätt), the regional court of appeal.
References:Château de Niort is a medieval castle in the French town of Niort. It consists of two square towers, linked by a 15th-century building and dominates the Sèvre Niortaise valley.
The two donjons are the only remaining part of the castle. The castle was started by Henry II Plantagenet in the 12th century and completed by Richard the Lionheart. It was defended by a rectangular curtain wall and was damaged during the Wars of Religion. In the 18th century, the castle served as a prison.
The present keeps were the central point of a massive fortress. The southern keep is 28m tall, reinforced with turrets. The northern tower is slightly shorter at 23m. Both are flanked with circular turrets at the corners as well as semicircular buttresses. Each of the towers has a spiral staircase serving the upper floors. The Romanesque architecture is of a high quality with the dressed stones closely jointed.